排序

class TrainingData(models.Model):
    """培训资料"""

    name = models.ForeignKey(Training, on_delete=models.CASCADE)
    file_upload = models.FileField(upload_to="./", verbose_name="资料")
    photo = models.ImageField(blank=True, null=True, help_text="图片")  # 照片
    CV = models.FilePathField(blank=True, null=True, path="training/static/images", verbose_name="附件")
    update_time = models.DateField("资料上传日期", blank=True, null=True, auto_created=True)

    def __str__(self):
        return self.CV

    class Meta:
        verbose_name = "培训资料"
        ordering = ['-update_time']  # -逆序